Window frame construction



Aug. 30, 1938..

H. M. WOELFEL WINDOW FRAME CONSTRUCTION Filed April 16, 1957 ailPatented Aug. 30, 1938 PATENT OFFICE wmnow FRAME consrauo'rron Harold M.Woelfel, Montreal, Quebec, Canada, assignor to The Robert MitchellCompany, Limited, Montreal, Quebec, Canada.

Application April 16, 1937, Serial No. 137,306

2 Claims.

the occurrence of what is known as frosting orsweating of the frame. v

It is an object of this invention to provide an inexpensive and easilyassembled metal sash frame comprising inner and outer sections held outof direct contact with each other by insulating material which preventsthe transmission of cold from the outer to the inner side of the frame.This object is preferably achieved by the employment of inner and outerframe sections of substantially L-shape in cross section. These framesections are fitted togetherto form an inwardly facing channel in whichtheglazing is cemented in place so that the cement, which is of lowthermal conductivity, is interposed, as an insulating barrier, betweenthe glazing and the side and bottom walls of the channel. In formingthis glazing receiving channel the L-shaped frame sections are reverselyarranged and fitted one within the other so that the bottom of thechannel is formed by overlapping flanges of the sections. Theseoverlapping flanges are held out of direct contact with each other byan'interposed layer of fibrous or other insulating material of lowthermal conductivity. The flange of the inner frame section which formspart of the bottom wall of the channel is made sufficiently narrow sothat its inner edge is held out of direct contact with the opposingsurface of the outer 35 frame section by the glazing and glazing cementinterposed between the frame sections.

It is also an object of this invention to provide an improved glazingassembly for use in connection with the improved frame construction.

40 To this end the invention contemplates the provision of a glazingassembly comprising inner and outer glass plates having their marginalportions cemented together by a hardened cementitious plastic resinouscomposition which serves to hold the body portions of the plates inspaced relation. After they have been cemented together by the resinouscomposition the edges of the glass plates are enclosed by a thin closelyfitting U-shaped metal binding frame which serves to reinforce theplates against relative outward displacement. This assembly is thenmounted in place within the channel formed by the previously mentionedL-shaped inner and outer members of the sash frame.

Proceeding now to a more'detailed description reference will be had tothe accompanying drawing wherein- Fig. 1 is an elevation of the metalwindow sash and glazing assembly provided in accordance with thisinvention.

Fig. 2 is a transverse sectional view through the assembly shown inFig. 1. This view also" shows the manner in which this assembly ismounted within the window frame of a railway car.

As shown in the drawing the sash frame, generally indicated at 5,comprises inner and outer sections 6 and l which are substantiallyL-shaped in cross section. These frame sections are fitted together sothat their flanges 9 form the side walls of a U-shaped channel, thebottom of which is formed by the remaining flanges i0 which are disposedin overlapping relation and are held out of direct contact with eachother by an interposed layer H of fibrous or other suitable insulatingmaterial of low thermal conductivity. The flanges Ill are securedtogether by screws I2 which also pass through the interposed insulatingmaterial. The two frame sections are preferably secured together in thismanner so that the outer side of the flange 9 of section l lies in acommon plane with the free edge of the flange H] of the companionsection 6. It will also be observed that the width of flange III ofsection I is such that the inner edge of this flange terminates short ofthe inner surface of the flange 9 of section 6.

In the present instance the glazing fitted in the channel formed by theframe sections 6 and 1 comprises a pair of glass plates which arecemented together in spaced relation by means of a hardened plasticresinous cementitious composition I5 interposed between the edgesthereof. This material i5 forms; with the glass plates I4, a sealed airspace l6 which is useful in preventing sweating or frosting of theinside glass plate M. The edges of the glass plates M are also heldtogether by a thin closely fitting U-shaped metal frame H. The glazingassembly comprising the glass plates 14 and the marginal .binding frameH is secured in the channel of the sash frame by means of the cementindicated at I8. The cement used in this connection is preferably of lowthermal conductivity and serves to form an insulating layer between theglazing assembly and the side and bottom walls of thesash frame. Thesash assembly described herein may be secured in the metal window frameof a railway car as shown. in Fig. 2. In this connection it will benoted that the sash frame is cemented to the window frame as indicatedat ll with the flange 8 of the frame member 6 butted against one side ofa rubber cushioning strip 20 the opposite side of which is held in placeby the portion 2| of the window frame. It will thus be seen thatthemetal frame sections and I are held out of direct contact with eachother by the interposed flbrousmaterial H and cement I8 which serve asinsulation preventing transmission of cold from the outside to theinside of the metal frame. The only metal to metal contact between theframe sections 6 and I is that afforded by the fastening screws l2 butthis does not permit sufficient transmission of cold from the outside tothe inside of the frame to produce frosting or .sweating of the frame.

I the channel in which it is secured.

Having thus described my invention, what I claim is:-

1. A window construction comprising a sectional metal sash frameconsisting of inner and outer L-shaped frame sections fitted together toform an inwardly facing channel, said frame sections being reverselyarranged and fitted one within the other so that the bottom of thechannel is formed by overlapping flanges of the sections, a layer offlbrous or other insulating material of low thermal conductivityinterposed between the overlapping flanges to hold them out semblycomprising inner and outer glass plates having their marginal portionscemented together so that the body portions of the plates are disposedin spaced relation and a thin closely fitting U-shaped metal bindingframe embracing the edges and the adjacent outer surfaces of the glassplates to reinforce them against relative outward displacement, thecement employed for holding the glazing assembly in said channel beingdisposed to form an insulating barrier of substantial thickness betweenthe glazing and the side and bottom walls of the channel.

2. A window construction comprising a sectional metal sash frameconsisting of inner and outer L-shaped frame sections fitted together toform an inwardly facing channel, said frame sections being reverselyarranged and fltted one within the other so that the bottom of thechannel is formed by overlapping flanges of the sections, insulatingmaterial of low thermal conductivity interposed between the overlappingflanges to hold them out of direct contact with each other and a glazingassembly cemented in place within said channel, said assembly comprisinginner and outer glass plates having their marginal portions cementedtogether so that the body portions of the plates are disposed in spacedrelation and a layer of cement interposed between the walls of thechannel and the glazing assembly to secure the latter in place, saidcement being disposed to form an insulating barrier of substantialthickness between the glazing and the side and bottom walls of thechannel.

HAROLD M.'WOELF'EL.

